package nio;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class ChannelCopy {

	private static final int BSIZE = 1024;
	
	public static void main(String[] args) throws IOException{
		if(args.length != 2) {
			System.out.println("arguments: sourcefile destfile");
			System.exit(1);
		}
		
		FileChannel in = new FileInputStream(args[0]).getChannel();
		FileChannel out = new FileOutputStream(args[1]).getChannel();
		
		/*ByteBuffer buffer = ByteBuffer.allocate(BSIZE);
		while(in.read(buffer)!= -1) {
			buffer.flip(); // Prepare for writing
			out.write(buffer);
			buffer.clear(); // Prepare for reading;
		}*/
		
		in.transferTo(0, in.size(), out);
		// Or:
		// out.transferFrom(in, 0, in.size());
	}
}
